* Change version 

* Add Zipkin receiver

* support shardingjdbc database storage feature

* 1. Add the performance collection point.
2. Report formatter.

#1032

* Add a new cache implementation by caffeine.

#1032

2. Report formatter.

#1032

#1009

* [maven-release-plugin] prepare release apm-5.0.0-alpha

* [maven-release-plugin] prepare for next development iteration

Fix assmbly for mvn clean install -Papache-release and update version to SNAPSHOT for SNAPSHOT release.

Make agent gRPC to be a collector module.
Make agent jetty to be a collector module.
Make agent stream to be a collector module.

Appand modules: apm-collector-baseline and apm-collector-baseline-computing for jd contributor team.

#423